Modem

Chapter 4—MODEM AT Commands, S-Registers, Result Codes

Modem Response (Result Code) Commands

ISIHI-2S modems can give responses to commands. The most common is OK, but the modems also can alert you or your software to dial tones, busy signals, connection speeds, and whether the connection is made with error correction or compression enabled. These responses are called result codes; they can be terse (numbers) or verbose (text).

En Echo Command Mode Characters

n = 0 or 1 Default: E1

 

Normally, when you type commands on the keyboard, the modem echoes the characters

 

back to the computer or terminal, which displays them on the monitor. Use the E

 

command to turn this feature off and on.

 

E0 disables the echo.

 

E1 enables the echo.

Qn

Result Codes Enable/Disable

 

n = 0 or 1

 

Default: Q0

 

Use the Q command to enable or disable result codes for applications such as computer-

 

controlled auto dialing.

 

Q0 (or Q) enables result codes.

 

Q1 disables result codes for applications such as computer-controlled auto-dialing.

Vn

Result Codes (Verbose/Terse)

 

n = 0 or 1

 

Default: V1

 

The V command controls whether the modem’s result codes display as text (verbose) or

 

numeric (terse) messages. For example, if no carrier signal is detected after dialing, the

 

result can display either as NO CARRIER or as the number 3.

 

V0 (or V) displays the modem’s result codes as a number.

 

V1 displays result codes as text.

Xn

Result Codes and Call Progress Selection

 

n = 0, 1, 2, 3, 4, 5, 6, or 7

 

Default: X4

 

The X command selects which result codes the modem provides in command mode and

 

determines whether the modem uses smart dialing or blind dialing. When it smart dials,

 

the modem listens for dial tones and busy signals and responds to them. When it blind

 

dials, the modem ignores the signals and relies on timing instead.

 

X0 causes the modem to blind dial. Instead of looking for a dial tone, it pauses for the

 

time set in register S6 and then dials regardless. Once a connection is made, it sends the

 

Bell 103 basic code CONNECT to the terminal. It ignores any busy signals.

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MultiModemISI Hybrid Series, ISIHI-2S

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Multi Tech Equipment ISIHI-2S manual Modem Response Result Code Commands, En Echo Command Mode Characters
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ISIHI-2S specifications

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